發(fā)布時間：2018-11-11 01:16

【摘要】：感應電機雙PWM變流器由PWM整流器和PWM逆變器通過直流環(huán)節(jié)連接構(gòu)成，研究其控制策略對于提高系統(tǒng)性能具有重要意義。近年來，模型預測控制憑借其在解決多約束、多目標優(yōu)化等方面的優(yōu)勢，在電力電子領域得到諸多應用。本文對感應電機雙PWM變流器有限控制集模型預測控制（FCS-MPC）及改進控制策略進行了研究。 首先，以兩電平PWM整流器為對象，介紹了FCS-MPC策略的基本原理。針對FCS-MPC存在的開關(guān)頻率非恒定和采樣頻率較高的缺點，，給出了一種PWM整流器有限開關(guān)序列模型預測電流控制（FSS-MPCC）策略。PWM整流器FSS-MPCC通過構(gòu)建12組開關(guān)序列作為控制集，采用無差拍控制方式求取每組開關(guān)序列內(nèi)各個開關(guān)狀態(tài)的作用時間，構(gòu)建目標函數(shù)，在線尋優(yōu)。通過MATLAB軟件驗證了PWM整流器FSS-MPCC的有效性，并與FCS-MPC進行了對比分析，表明了所給出的FSS-MPCC能在較低采樣頻率下實現(xiàn)恒頻控制，且仍具有FCS-MPC的高動態(tài)性能。 其次，研究了一種三電平PWM整流器模型預測電流控制（MPCC）策略。針對中點電位波動問題，分析了不同電壓矢量對中點電位的影響，給出了一種基于查表的中點電位平衡控制方法。建立了三電平PWM整流器αβ坐標系下的數(shù)學模型，設計了三電平PWM整流器MPCC控制系統(tǒng)，并進行延時補償。對整流器MPCC系統(tǒng)進行了仿真分析，驗證了所給出的中點電位平衡方法的有效性。 再次，為優(yōu)化MPCC尋優(yōu)過程、減少計算量，給出了一種感應電機NPC三電平逆變器準無差拍模型預測電流控制（QD-MPCC）策略。設計了感應電機QD-MPCC準無差拍控制器，求出電機定子給定電壓矢量，預測定子電流，構(gòu)建目標函數(shù)，從其所處扇區(qū)包含的電壓矢量中尋優(yōu)，減少滾動次數(shù)，提升尋優(yōu)效率，進而減少計算耗時。設計了基于QD-MPCC的感應電機控制系統(tǒng)，進行了數(shù)字延時補償，在系統(tǒng)中采用了一種閉環(huán)磁鏈觀測器以提高磁鏈觀測精度。通過仿真驗證了感應電機QD-MPCC策略的有效性，表明了感應電機QD-MPCC系統(tǒng)具有良好的動靜態(tài)性能和較強的魯棒性。 最后，介紹了PWM整流器實驗平臺和感應電機QD-MPCC系統(tǒng)實驗平臺，進行了實驗研究，分析了實驗結(jié)果，進一步驗證了所述控制策略的有效性。
[Abstract]:The double PWM converter of induction motor is composed of PWM rectifier and PWM inverter connected by DC link. It is very important to study its control strategy for improving the system performance. In recent years, model predictive control (MPC) has been widely used in power electronics field because of its advantages in solving multi-constraint and multi-objective optimization. In this paper, the finite control set predictive control (FCS-MPC) and improved control strategy for dual PWM converter of induction motor are studied. Firstly, the basic principle of FCS-MPC strategy is introduced based on the two-level PWM rectifier. Aiming at the disadvantage of unsteady switching frequency and high sampling frequency in FCS-MPC, This paper presents a predictive current control (FSS-MPCC) strategy for finite switching sequence model of PWM rectifier. PWM rectifier FSS-MPCC constructs 12 sets of switching sequences as control set. The action time of each switching state in each group of switch sequences is obtained by using the deadbeat control method, and the objective function is constructed to search for the best on line. The validity of PWM rectifier FSS-MPCC is verified by MATLAB software, and compared with that of FCS-MPC. It is shown that the proposed FSS-MPCC can realize constant frequency control at lower sampling frequency and still has the high dynamic performance of FCS-MPC. Secondly, a three-level PWM rectifier model predictive current control (MPCC) strategy is studied. The effect of different voltage vectors on midpoint potential is analyzed, and a control method of midpoint potential balance based on look-up table is presented. The mathematical model of three-level PWM rectifier in 偽 尾 coordinate system is established, and the MPCC control system of three-level PWM rectifier is designed, and the delay compensation is carried out. The simulation analysis of rectifier MPCC system is carried out to verify the effectiveness of the proposed midpoint potential balance method. Thirdly, in order to optimize the MPCC optimization process and reduce the computational complexity, a quasi-deadbeat model predictive current control (QD-MPCC) strategy for NPC three-level inverter of induction motor is presented. The QD-MPCC quasi beat controller of induction motor is designed, the stator voltage vector is given, the stator current is predicted, the objective function is constructed, and the optimization is obtained from the voltage vector contained in the sector, which can reduce the rolling times and improve the optimization efficiency. Thus, the computational time is reduced. The control system of induction motor based on QD-MPCC is designed, and the digital delay compensation is carried out. A closed loop flux observer is used to improve the observation accuracy of the flux. The effectiveness of the QD-MPCC strategy of induction motor is verified by simulation. It is shown that the induction motor QD-MPCC system has good dynamic and static performance and strong robustness. Finally, the experimental platform of PWM rectifier and QD-MPCC system of induction motor is introduced. The experimental results are analyzed and the effectiveness of the control strategy is further verified.
【學位授予單位】：中國礦業(yè)大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM46

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